ABSTRACT
Contrast sensitivity testing has been recommended as a more sensitive indicator of early visual loss than visual field testing. Using gravity inversion to induce an intraocular pressure rise, we performed contrast sensitivity testing on each eye of 10 normal subjects in the upright and inverted positions. Contrast sensitivity results were not altered in the head-down position, even though in 5 of the 10 subjects (7 of 20 eyes), visual field alterations on static perimetry were elicited during inversion. In both of these evaluations, the subject's results in the upright position served as the control, freeing us from reliance upon age-matched populations. We conclude that precise measurement of static thresholds with automated perimetry is more sensitive than routine contrast sensitivity testing in detecting visual dysfunction related to transient acute elevations of intraocular pressure.
Subject(s)
Contrast Sensitivity , Intraocular Pressure , Visual Fields , Adult , Humans , Posture , Visual Field TestsABSTRACT
La contaminación por ruido es una realidad en nuestro medio. El nivel de ruido intraoperatorio se aproxima a los 75 dBA como promedio. Estos niveles son superiores a los mínimos que producen alteraciones en diversos sistemas del organismo. En las clínicas privadas los ambientes son menos ruidosos que en los hospitales estatales, probablemente por menor presión asistencial y por una construcción más moderna. Es recomendable mantener el mínimo personal necesario ya que el nivel de ruido aumenta proporcionalmente al número de personas; evitar conversaciones innecesarias y alejar las fuentes de ruido de los pacientes y del personal